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Cadmium interference with iron sensing reveals transcriptional programs sensitive and insensitive to reactive oxygen species

Abstract Iron (Fe) is an essential micronutrient whose uptake is tightly regulated to prevent either deficiency or toxicity. Cadmium (Cd) is a non-essential element that induces both Fe deficiency and toxicity; however, the mechanisms behind these Fe/Cd-induced responses are still elusive. Here we e...

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Published in:Journal of experimental botany 2022-01, Vol.73 (1), p.324-338
Main Authors: McInturf, Samuel A, Khan, Mather A, Gokul, Arun, Castro-Guerrero, Norma A, Höhner, Ricarda, Li, Jiamei, Marjault, Henri-Baptiste, Fichman, Yosef, Kunz, Hans-Henning, Goggin, Fiona L, Keyster, Marshall, Nechushtai, Rachel, Mittler, Ron, Mendoza-Cózatl, David G
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cited_by cdi_FETCH-LOGICAL-c357t-81bea8c35504d2f34446729fa29855256678f8f907ff83de74c8475534573a2c3
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container_title Journal of experimental botany
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creator McInturf, Samuel A
Khan, Mather A
Gokul, Arun
Castro-Guerrero, Norma A
Höhner, Ricarda
Li, Jiamei
Marjault, Henri-Baptiste
Fichman, Yosef
Kunz, Hans-Henning
Goggin, Fiona L
Keyster, Marshall
Nechushtai, Rachel
Mittler, Ron
Mendoza-Cózatl, David G
description Abstract Iron (Fe) is an essential micronutrient whose uptake is tightly regulated to prevent either deficiency or toxicity. Cadmium (Cd) is a non-essential element that induces both Fe deficiency and toxicity; however, the mechanisms behind these Fe/Cd-induced responses are still elusive. Here we explored Cd- and Fe-associated responses in wild-type Arabidopsis and in a mutant that overaccumulates Fe (opt3-2). Gene expression profiling revealed a large overlap between transcripts induced by Fe deficiency and Cd exposure. Interestingly, the use of opt3-2 allowed us to identify additional gene clusters originally induced by Cd in the wild type but repressed in the opt3-2 background. Based on the high levels of H2O2 found in opt3-2, we propose a model where reactive oxygen species prevent the induction of genes that are induced in the wild type by either Fe deficiency or Cd. Interestingly, a defined cluster of Fe-responsive genes was found to be insensitive to this negative feedback, suggesting that their induction by Cd is more likely to be the result of an impaired Fe sensing. Overall, our data suggest that Fe deficiency responses are governed by multiple inputs and that a hierarchical regulation of Fe homeostasis prevents the induction of specific networks when Fe and H2O2 levels are elevated. Cadmium induces an iron deficiency response often explained by root uptake competition. Here we show that Cd also impairs Fe sensing in leaves, even when Fe is in sufficient quantities.
doi_str_mv 10.1093/jxb/erab393
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Cadmium (Cd) is a non-essential element that induces both Fe deficiency and toxicity; however, the mechanisms behind these Fe/Cd-induced responses are still elusive. Here we explored Cd- and Fe-associated responses in wild-type Arabidopsis and in a mutant that overaccumulates Fe (opt3-2). Gene expression profiling revealed a large overlap between transcripts induced by Fe deficiency and Cd exposure. Interestingly, the use of opt3-2 allowed us to identify additional gene clusters originally induced by Cd in the wild type but repressed in the opt3-2 background. Based on the high levels of H2O2 found in opt3-2, we propose a model where reactive oxygen species prevent the induction of genes that are induced in the wild type by either Fe deficiency or Cd. Interestingly, a defined cluster of Fe-responsive genes was found to be insensitive to this negative feedback, suggesting that their induction by Cd is more likely to be the result of an impaired Fe sensing. Overall, our data suggest that Fe deficiency responses are governed by multiple inputs and that a hierarchical regulation of Fe homeostasis prevents the induction of specific networks when Fe and H2O2 levels are elevated. Cadmium induces an iron deficiency response often explained by root uptake competition. 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subjects Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Cadmium - metabolism
Cadmium - toxicity
Gene Expression Regulation, Plant
Hydrogen Peroxide
Iron - metabolism
Plant Roots - metabolism
Reactive Oxygen Species
title Cadmium interference with iron sensing reveals transcriptional programs sensitive and insensitive to reactive oxygen species
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